You can find you PSU specs either on your computer manufacturer's website or by opening your computer's case and checking it directly. As for the 7300, if you can try to avoid video cards with second numbers lower than 6. For example, a GeForce 6600 will give 30+ more fps than a 7300.
EDIT: if you can get an ATI card, GW seems to like ATI video cards better than nVidias.
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